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AS-T584-105,

AS-T584-105

二次再热技术自动化控制的成功应用，诞生出了全球效率最高的火电机组。而这项高精尖的技术又是如何诞生的
　　6月的泰州已经有了夏日的闷热感。走在长江边的国电泰州电厂内，不一会就会热的满身大汗。
　　这里是国内最早一批百万千瓦超超临界火电机组(国电泰州电厂一期两台机组)的所在地。而如今，国电泰州电厂二期、世界首台百万千瓦超超临界二次再热燃煤发电机组，是当今世界上发电效率最高、供电煤耗最低、环保指标最优的火电机组，代表了目前火力发电领域的最先进水平。
　　论起国电泰州电厂二期能够成为世界上发电效率最高、供电煤耗最低、环保指标最优的火电机组的首要功臣，非二次再热技术莫属。那么，让二次再热技术能够安全高效运转的首要功臣，则是北京国电智深控制技术有限公司研发的，针对燃煤火电机组二次再热技术的DCS系统。
　　DCS系统如何保障了国电泰州电厂二期、世界首台百万千万超超临界二次再热燃煤发电机组的高效运行这套完全自主知识产权、打破垄断的系统，又是经历了哪些困难才顺利诞生的
　　艰难诞生
　　“二次再热是煤炭清洁高效利用的一个有效途径。”北京国电智深控制技术有限公司副总经理黄焕袍对记者说，“二次再热在国外最早可以追溯到上世纪的60年代。但是国外在二次再热的利用方面单机最大装机容量大约只有70万千瓦。百万千瓦火电机组的二次再热是中国首创。”二次再热技术主要是通过在常规一次再热机组基础上增加一级再热器(锅炉)和增加超高压缸(汽机)，进一步提高蒸汽参数(温度和压力)。这些参数提高之后，那么机组的燃煤效率、热循环效率和发电效率就提高了。
　　这就要求设备需要重新设计制造，设备流程也与之前有了较大的不同。可以说，百万千瓦二次再热机组是目前世界上结构最复杂的燃煤机组。
　　如此大规模和复杂的对象，对火电厂的控制系统提出了更高的要求。“最开始，我们对于让北京国电智深控制技术有限公司来开发这一套系统，是存在一定的疑惑的。”国电泰州发电有限公司副总经理张苏闽对《能源》杂志记者说，“我们当时倾向于让国外有过二次再热项目业绩的公司来做。”
　　火电厂控制系统开发企业数量多、竞争激烈。除了外企之外，还有数量不少的国内企业也参与了竞争。国电智深于2013年11月与国电泰州发电有限公司签订DCS与仿真供货服务合同，承担了该电厂DCS与仿真系统研发制造供货和工程应用服务。
　　国电泰州电厂二期百万千瓦超超临界机组二次再热项目是国家科技支撑计划项目——“高效率低排放的超600℃百万千瓦等级超超临界机组关键技术研究与工程应用”中，课题“二次再热1000MW超超临界机组关键技术工程示范”的依托示范工程。这是世界上首次在百万千瓦机组上采用超超临界、二次再热技术，是国家燃煤发电节能减排示范项目。

上亿库存，国内外近千个仓库，公司部分产品型号如下，欢迎联系哦~！

SLC/1746 System 1746-IH16 DC INPUT MODULE FOR PROGRAMMABLE CONTROLLER

Distributed I/O 1790P-T4T0 PROFIBUS,4 INPUT THERMOCOUPLE BASE, TERMINAL BLOCK

Application-specific products 9358-PB10ENE RSBIZWARE BATCH FOR PROCESSLOGIX 10 UNITS

Operator Interface 2711-NF2A FUNCTION KEY STRIP PV900 MONO

Support 9220-WINTAS SUPT RENEWAL CONTRACT FOR 9220WINTA

Support 9351-OSFRTR SUPT REINSTATEMENT CONTRACT FOR 9351OSFRT

ControlNet Products 2706-P43R INVIEW MESSAGE DISPLAY. 1 LINE, 20 CHARACTERS

RSI Software Products 9301-2SE3350ESU2 RSVIEW32 RUNTIME 300-5K UPGRADE IN-SUPT (ES)

RSI Software Products 9701-VWSS000AENE RSVIEW SE SERVER UNLIMITED DISPLAY

RSI Software Products 9399-RL50GRPT RSLOGIX 500 GETTING RESULTS GUIDE (PORTUGUESE)

Motion Control 1394C-AM50-IH MODULE,AXIS,INTL HTSNK,10KW,23.3A CONT,33.2A PK

BC646MDD159 Logic Developer PC w/Runtime (HRT) 1,500 I/O

IC300OCS035 OCS with 2x20 LCD Display and with 16-key tactical feel keypad. Built in I/O no expansion. One RS-232 serial port supporting CsCAN and RTU Master/Slave. 8 DC Inputs (12/24vdc), 6 Relay Outputs (4.0A per point).No network interface.

IC752SKT009 Datapanel 150 Starter Kit: Includes Datapanel 150 (DFT000), download & communication cables, DataDesigner, user & programming manuals.

MTR-3T12-G-R-0-M-S MTR series metric servo motor with resolver and shaft seal

ZA06B-6130-H402 External regeneration resistor rated 100 Watts for BSVM1-20i Beta i series amplifier

20CD300A0ANNBNA0 PowerFlex 700H AC Drive 20C

20G1AGC140JN0NNNNN PowerFlex 755 AC Packaged Drive

25A-E019N104 PowerFlex 523 11kW (15Hp) AC Drive

2711P-T6M20A8 PanelView Plus 6 6 Grayscale Touch AC

6SE6440-2UD33-7EB1 37KW

1492-L2-BR 1-Ckt Feed-Through Blk 1.5mm

1492-XIM4024-16RF Connection Products

软启动器 3RW44251BC44

工艺模块 6ES7 550-1AA00-0AB0 TM Count 2 x 24 V：2 通道高速计数器与位置采集 ( 增量型编码器，24V 信号 ), 35mm 模块，不含前连接器

1585-C8PB-S100 Cable Spool Ethernet Media

1746-R13 SLC Replacement Covers and Labels

1790-T0W8X CompactBlock LDX 8 Expansion Block

194E-A16-1753-4G 16 A 194E Load switch

20-PP10023 WIRE MODIFICATION KIT REPL REV E & OLDER

2090-CSBM1DF-18AA35 Kinetix Cable Single DSL 2090-Series

20AC037F0AYNANC0 PowerFlex 70 AC Drive 20A

GC-FDT-DTM-SW1 FDT-DTM Software for use in FDT frame applications (shipping version). Existing DTM that communicates serially and is used primarily with MTL HART Multiplexers and Serial BIMs (8502 and 8505)

HE660BGM224 Discontinued Part. Check with GE IP on migration path.

IC600LR605RR 4K/1K Combined Memory

IC647HSTES3KM Historian Enterprise Server 2500 Points (M4 Key)

IC650ESS004RR Series Six Carrierband Lan Interface, Single Slot (MAP 30)

IC694BEM320 RX3i Communication Module, I/O Link Interface Module (Slave). Module uses RX3i high speed serial bus.

IC756SDV001CT-99 DV Development - Solaris Op Sys Addt'l User, Traditional Chinese, Vers ion 9.9

MicroLogix 1500/1769 System 1764-MM1 MICROLOGIX 1500 MEMORY MODULE

PLC-5/1771 System 1771-WHF FUSED WIRING ARM

Distributed I/O 1794-OE4K CONFORMAL COATED, ANALOG OUPUT MODULE, 4 POINT

Communications 9399-WAB32UGFR RSLINX USER GUIDE (FRENCH)

Support 6233-52VTLS SUPT RENEWAL CONTRACT FOR 623352VTL

Support 9358-BPMG01S SUPT RENEWAL CONTRACT FOR 9358BPMGR01ENE

Support F1771-IXESERC FIRMWARE UPGRADE FOR 1771-IXE I/O MODULE

RSI Software Products 9324-RLD0U6DEE RSLOGIX 5000 SERVICE ED TO FULL UPG, DEU

RSI Software Products 9301-2SE350PTU1R RSVIEW32 RUNTIME 32K-100K UPGRADE OUT-SUPT (PT)

RSI Software Products 9358-MTRCK01ENE RSBIZWARE MATERIALTRACK (1 BATCH SERVER)

Motion Control 8720SM-018S2FAS1 18.5KW/41.4 AMP, 750 VDC, AC MOTOR WITH SRS60 ENC.

829-4-0 Thumbwheel Assembly. 4 Digit, 0 True. Dust Seal

IC200MDL643 INPUT 5/12VDC POS/NEG LOGIC (2 GROUPS OF 8) 16PT

IC697PCM711-MP Programmable Coprocessor Modified for use by OEMs

MTR-1324-N-A-E-SRR Stepping Motor Nema34 Splashproof

ZA06B-0032-B175#7008 B2/3000 servo motor with holding brake and 32k serial encoder

20BD125A0AYNAND0 PowerFlex 700 AC Drive 20B

20G11ND027AA0NNNNN PowerFlex 755 AC Packaged Drive

22F-RF026-CL PowerFlex 4M EMC Filter Kit

110XCA28201 Momentum RS232 COMM CABLE 1M (OEM)

294E-FD1P5Z-G1 Variable Frequency Drive

S82K-10024 220VAC. 容量：100W输出 24V 4.2A导轨安装型。停产，可用S8VS-12024

1492-SPM3B160-N MCB Supplementary Protector 16 A

软启动器 3RW40262BB14

TS 模块 6ES7 972-0EB00-0XA0 TS Adapter IE Basic

150-F625NBED SMC Flex Smart Motor Controller

1734-IE2C POINT I/O 2 Point Analog Input Module

1783-BMS20CGP Stratix 5700 20 Port Managed Switch

193-EMRZ01 E1 Plus 115V DC Remote Reset Solenoid

20-750-EMC1-F1 PF753 & PF755 FR 1 EMC CORES W PLATE

2090-CPWM7DF-12AA07 MP-Series 7m Power Cable

2098-DSD-020-DN Ultra 3000 Servo Drive

G-C440/OBG PC to GagePort Cable and Power Supply (25 pin for Owens Brockway OEM)

GFK-2142 Bus Conversion Unit Installation Guide

IC220STR001 MOTOR STARTER DIRECT, 1.5KW/400VAC

IC647EIMC EIM:Honeywell EIM 620

IC647SAX001 Scheduler Dynamics AX Toolkit

IC693MDL634LT 24 Vdc Input, Negative/Positive Logic (8 Points) (LT)

IC756DVE000K-97 EO GECK (Graphical Editor Construction Kit) - Unix, Korean, Version 9. 7

MSI-QUAL-2-43 Quality Mang Clients 2 Pack-43

PLC-5/1771 System 1771-A2B I/O CHASSIS ASSEMBLY, 8 SLOT

Distributed I/O 1790D-8BV8B DNET LDX ,24VDC,8 UNIV IN/8 SRCE OUT BASE, D-SHELL

Communications 1770-CD3 DATA HWY TWINAXIAL CABLE, 300 FT/91 M

Operator Interface 2711E-UT12ET10 PANELVIEW 1200E TOUCH TO 1000E TOUCH MIGRATION KIT

Support 9305-RSVADFCDES SUPT RENEWAL CONTRACT FOR 9305RSVADFCDE

Support 9324-RLDSFCER SUPT REINSTATEMENT CONTRACT FOR 9324RLDSFCE

EtherNet/IP Products 1756-EWEB CLX ENET/IP ENHANCED WEB SERVER MODULE

RSI Software Products 9301-2SE3400JPU3 RSVIEW32 RUNTIME 150-32K UPGRADE IN-SUPT (JP)

RSI Software Products 9371-RSWDI1U2R UPGRADE:OUT-SUPT:RSWIRE DES IED PROF ACAD TO STDAL

Motion Control 1326AB-B420H-M2K4L MOTOR,SERVO,460V,5.1NM,6000RPM,MULTI,BRK,IP67

2325-LV Greyline OS, 4 Line, (20) 5MM Chars, VFD, ASCII /Serial Interface, 10-30 VDC, NEMA 4

HMI-AGO-201 ANTI-GLARE OVERLAY 9"

IC693ACC335 Axis Terminal Block for the Motion Mate DSM302

QPK-DEM-S02 QUICKPANEL JR DEMO 6" STN

TGT-AI0V-16-0RR Target Analog Module 8 inputs/8 outputs

20BC5P0A0AYNACC0 PowerFlex 700 AC Drive 5 A at 2.2 kW 20B

20F1ANE099AA0NNNNN PowerFlex 753 AC Packaged Drive

22B-D1P4H204 PowerFlex 40- 0.4 kW (0.5 HP) AC Drive

140DDM39000C Quantum 开关量DC混合模块,16点输入,24VDC;8点输出,

284E-FVD4P0Z-10-CRN EtherNet Variable Frequency Drive

TL-F20MY1 12mm,电感式,二线,常开200mA 电源:90-250VAC沟形

1492-SPM1C005-N MCB Supplementary Protector 0.5 A

通用型变频器 6SE6 420-2UC21-1BA1 "1.1 KW，149 x 202 x 172"

电机启动器 3VU13400ML00

1497D-A17-M14-0-N Gen Purpose Transformer

1608N-003A230V2S 3 A Mini DySC Sag Corrector

1769-OF4 CompactLogix 4 Pt A/O C and V Module

190S-ANEJ2-CB25C-KN 1.6-2.5 A Compact Comb Starter W/Ckt-Bkr

194R-NE125-1754 Disconnect Non-Fused IEC 4 Poles 125A

2090-CPBM7DF-16AA40 MP-Series 40m Standard Cable

2090-XXTFMP-S25 MP-Series 25 m Length Feedback Cable

CFBA-0WPB-0140-AZ Encoder cable for BM0.5/4000 or BM1/4000 motors. 14 meter

GF-3610R Connecting FlashCable to CDI Torque Wrench (PET-M/S).

IC200UDR005 28 point PLC,(16) 24VDC In, (11) Relay Out, (1) 24VDC Out, 120V/240AC Power Supply. Battery (IC200ACC403) is required for data retention. B attery not included.

IC646TRT075 75 I/O Point Runtime System

IC647PATCDI0 Proficy PAT - Driver For CDI

IC693APU300RR High Speed Counter (HSC)

IC752FPY000RR Industrial Floppy Drive in Case for Touch Displays

IMC-101-M-ST-T 10/100 baseT to multi-mode ST fiber converter (-40 to 75 deg C op temp)

SLC/1746 System 1746-P1 POWER SUPPLY - RACK MOUNT

Industrial Computers 6186-M20SS VERSAVIEW 20 INCH MONITOR, TEMPERED GLASS

Application-specific products 1404-M505A-RIO MASTER MODULE - PQ RIO COM

Operator Interface 2711-K10C12L1 PV1000 COLOR KEY, PBUS & RS232 PRINT

Support 9301-2SE3200DER SUPT REINSTATEMENT CONTRACT FOR 93012SE3200DE

Support 9380-RSBEDREPS SUPT RENEWAL CONTRACT FOR 9380RSBEDREP

DeviceNet Products 1792D-0B4D 4 SOURCING OUTPUTS UP TO 2 AMPS, 4 CONNECTORS

RSI Software Products 9301-2SE3203ITE RSVIEW32 RUNTIME 300 WITH RSLINX (ITALIAN)

RSI Software Products 9358-BPMGR01ENE RSBATCH PRODUCTION MANAGER (SUPT 1 BATCH SVR)

Motion Control MPL-B4530F-MK22AA MOTOR,SERVO,8.36 NM,2800RPM,MULTI,460V

Motion Control 2090-SCVG5-0 SERCOS FBR CABL,CONN,STNDRD PVC JKT,GLASS,5.0M

GFZ-65192EN Alpha SVU Series Amplifier Description Manual

IC646MPM101 Logic Developer - PLC Nano/Micro w/Programming Cable

MTR-1331-J-E-D-E-S Stepping Motor Nema34, Series Wdg, Encoder, Splashproof

QPJ-DVN-202 Communication Module for 5 inch & 6 inch: DeviceNet Slave

20BC037A0AYNAND0 PowerFlex 700 AC Drive 20B

20F11NC060AA0NNNNN PowerFlex 753 AC Packaged Drive

22-COMM-L PowerFlex LonWorks Adapter

2711P-RGK6 PanelView Plus Accessory

280S-M24M-M1 ArmorStart Three-Phase Power Media

C200HW-COM02-V1 通信板RS232端口一个

1492-PDE1C112 200 A Enclosed Power Distribution Block

数字量输入/输出模块 6ES7421-1EL00-0AA0 DI/32 120V AC,浮点式

变送器 3RS10001CD20

1495-N85 Variable Depth Circuit Breaker Accessory

1585J-M8TBJM-6 RJ45 Ethernet Media

1761-CBL-PM02 MicroLogix Cable

188-K3B320 Miniature Circuit Breaker 32 A

194L-E20-1752 20A 194L Load Switch

2090-CPBM4DF-16AF60 MP-Series 60 m Length Cable

2090-XXNFMF-S60 Kinetix Drives 60m Standard Cable

BC647OEM0510 OEM Edge Program Additional Key - Complete (Approval Required)

GC647PATFS00 Proficy PAT - Driver For Foss Near Infrared Systems Near-Ir Spectrometers - Assist Support

IC200MDD846LT MIXED OUTPUT RELAY 2.0A PER PT ISOLATED 8PT / INPUT 120VAC GRP 8PT (LT )

IC646NSF000 Siemens TCP/IP OPC Server. Supports S7 & S5 controllers

IC647MBS001 Machine Edition Standard Development Suite with USB Hardware key

IC675PDI081 Profibus Station IP67 24VDC Positive Logic 8 Inputs

IC697MDL752 12 Vdc Output, 0.5 Amp, Positive Logic (32 Points)

IC800SSD104RS1RR 4.3A, 115/230V, S2K Servo Drive for MTR Series Motors

ControlLogix/1756 System 1756-DPALEN CONTROLLOGIX SYSTEM DOCUMENTATION SET PRINTED

Industrial Computers 6182H-15BRH6D VVCE 1500, KEY/TOUCH, STD MEM, RIO/DH, DC

Process Control 1757-DNBEXP65 DEVICENET MODULE EXPANSION, 50-65 MAX

Operator Interface 2711P-ST7B PANELVIEW PLUS 700 KEY/TOUCH COMBO STARTER KIT

Support 9326-AD1USR SUPT REINSTATEMENT CONTRACT FOR 9326AD1USENE

Support 9371-EDES3S SUPT RENEWAL CONTRACT FOR 9371EDES3

ControlNet Products 1794-ACN15 SINGLE MEDIA ADAPTER FOR CONTROLNET

RSI Software Products 9301-2SE240JPU3R RSVIEW32 WORKS 150-32K UPGRADE OUT-SUPT (JP)

RSI Software Products 9358-BA10ENE RSBIZWARE BATCH ARCHIVER 10 UNITS

Motion Control MPL-A4520K-HK22AA MOTOR,SERVO,6.10NM,4000RPM,ENCDR,230V,6.8KG

Motion Control 2090-UXNPAMP-10S01 CABLE,NOGRF50X,MOTOR POWER,MP,10 GAUGE,1M

CBL-203 Modicon 984 Cable

IC630MDL354RR 5-12Vdc (TTL) Sink/Source Output Module (32 points)

IC800SLCIV010 Interface Cable, 1000W SL Amplifier to Terminal Block, 1 Meter

OC647IFWOPCC iFIX Optn: WorkSpace OPC Client (M1Component Part)

20AD5P0A3AYNNNC0 PowerFlex 70 AC Drive 5 A at 3 Hp 20A

20DD022A3NYNACGNE PowerFlex 700S AC Drive 20D

20P41AB700RA0NNN PowerFlex 230V AC 200 HP DC Drive

2711C-K2M PanelView Comp C200 Graphic Terminal

280-PWRM24D-M2 ArmorConnect 3-PH Power Media drop cable

SRT2-ROC16 远程I/O端子（继电器输出）16点

1492-MCBA280 80A Miniature Circuit Breaker

1494V-DJ622-A-E NEMA Flange Mtd Rod Switch Disconnect Sw

软启动器 3RW44572BC34

工程组态编程软件 6AV2102-3AA04-0AE5 SIMATIC WinCC Advanced V14 Upgrade ：?V11..V13 -> V14

1585D-M4UBJM-70 1585D Ethernet Media Patchcord

1756-L72S Logix 5572S Automation Controller 4M/2M

1799-D10U10B 20 Point Embedded I/P/Output Comb Module

194E-FA16E-PD10 194E Load switch

2090-CFBM7DD-CEAA01 MP-Series 1m Servo Feedback Cable

2090-SCVG150-0 Kinetix 150-150m Fiber Optic Cable

BC646MPP005 Logic Developer PLC Professional 5 Pack with Proficy GlobalCare Complete

GC647APC005 GC Production Client 5 Pak

HMI-CCT-203 BACKLIGHT TUBE 6 inch Color STN or Monochrome (QPK2xxxxx2P)

IC641VPH700 VersaPro Professional Edition - Windows Programming Software with Prog ramming Cable for Series 90-70, Series 90-30, and VersaMax PLCs

IC647IFGLBLSRVRM iFIX WebSpace Server including iClient Dev and 2 Web Users(M4 Key)

IC660EBR101 Electronic Assembly for IC660BBR101

IC697ACC702 I/O Bus Terminator Plug

IC756WRE499J-22 DataViews Runtime for Windows 100+, Per User, Japanese, Version 2.2

FlexLogix System 1794-IF4I ISOLATED ANALOG INPUT MODULE, 16 BIT, 4 POINT

PLC-5/1771 System D6200-6.4.18 PLC5 STRUCTURE TEXT 1.0 USER MANUAL

Process Control 1757-SRC3 1757 REDUNANCY MODULE CABLE - 3 METER, 9.84 FT

Operator Interface 2711P-T10C6B2 PV PLUS 1000, TOUCH, ENET, AC PS, EXT MEM

Support 6001-A1DCR SUPT REINSTATEMENT CONTRACT FOR 6001A1DC

Support 2711-END1S SUPT RENEWAL CONTRACT FOR 2711END1

Support F1785-L46C15SERF FIRMWARE UPGRADE FOR 1785-L46C15 PLC5 PROCESSOR MO

RSI Software Products 9301-2SE230DEU2R RSVIEW32 WORKS 150-1500 UPGRADE OUT-SUPT (DE)

RSI Software Products 9701-VWSS000JPU2 RSVIEW SE 100 TO UNLTD UPG JAPANESE

RSI Software Products 9399-RSBPCDRG RSBATCH PCD PROGRAMMER'S REFERENCE GUIDE

Motion Control 1394C-SJT10-C-RL MODULE,SYSTEM,10KW,IMCS,W/RIO,W/AXIS LINK

BC646MOSS99 QuickPanel Control Development Software Site License with Proficy GlobalCare Complete. Supports QuickPanel, QuickPanel View, and QuickPanel Control.

IC300OCS062 OCS with 2x20 LCD Display and with 16 keypad. Built in I/O no expansion. 8 DC Inputs (12/24vdc), 8 DC Outputs (5/12/24vdc, 0.5A neg. logic with ESCP). Built-in network

IC752WFB253 Display Station 2020 Series - w/ touch - 12.1" SVGA (800x600), Pentium 350 MHz, 128 MB RAM, 6.4 GB HD, expansion slots, Ethernet, floppy drive, CD ROM front access, built-in keypad, with unlimited point count CIMPLICITY HMI R&D and Win '95

MTR-3T22-G-R-0-M-S MTR series metric servo motor with resolver and shaft seal

ZA06B-6150-H018 PSM-18HVi 18 kW high voltage power supply module for Alpha servos

20D-P2-CKE1 PowerFlex 700S Expanded Control Cassette

20G1AGE192JA0NNNNN PowerFlex 755 AC Packaged Drive

25B-A011N104 PowerFlex 525 2.2kW (3Hp) AC Drive

2711P-T7C4D9 PanelView Plus Terminal

6SE6430-2UD33-0DB0 30KW

1492-L3Q IEC Term Blck 5.1x79x31.3mm Spr Clp

1494C-CM5 Cable Mechanism

软启动器 3RW44261BC45

附件 6ES7 954-8LT03-0AA0 存储卡：32GB

1585BP-F8BF 1585 Ethernet Media Accessory

1746-RT32 SLC Replacement Terminal Block

1790D-T0V16 CompactBlock LDX 16 Point O/P Base Block

194E-A32-1753-Q 32 A 194E Load switch

20-PP13000 WIRE SET ASSY FI13

2090-CSBM1DF-18AF14 Kinetix Cable Single DSL 2090-Series

20AC060A0AYNANC0 PowerFlex 70 AC Drive 60 A at 30 kW 20A

GC646MBSS99 Proficy GlobalCare Complete for ME Standard Development Suite - Site License

HE690PGM100 Programmable Memory for HPL

IC600PM502RR Standard I/O Rack Power Supply, 115-230Vac